ERA diagram Short for entity-relationship-attribute diagram. A diagrammatic notation for describing and documenting an ERA model. Entities are shown as boxes in the ERA diagram and have an entity name; usually names are required to be unique. Attributes are generally shown as annotations of the entity boxes. Relationships are shown as lines between entity boxes. Markings on the line indicate the name(s) of the relationship, cardinality of the relationship (one to one, one to many, or many to many), and whether the relationship is optional or mandatory. Many software tools for editing diagrams can handle ERA diagrams.
More From encyclopedia.com
Mesozoic Era , In geologic time , the Mesozoic Era, the second era in the Phanerozoic Eon , spans the time between roughly 250 million years ago (mya) and 65 mya. T… erathem , erathem The chronostratigraphic unit that is equivalent to the geologic-time unit era. An erathem comprises a number of systems grouped together and… Paleozoic , Palaeozoic The first (570–248 Ma) of the three eras of the Phanerozoic. The Cambrian, Ordovician, and Silurian Periods together form the Lower Palaeo… Era , era •Altamira, chimera, clearer, Elvira, era, hearer, Hera, hetaera, interferer, lempira, lira, lire, Madeira, Megaera, monstera, rangatira, rearer,… Paleozoic Era , In geologic time , the Paleozoic Era, the first era in the Phanerozoic Eon , covers the time between roughly 544 million years ago (mya) and until 24… Mentoring , Mentors produce mentees, or protégés, who ultimately become mentors and perpetuate a cycle that has long-term and lasting effects on generations to c…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like